[Snyk] Security upgrade gatsby from 2.18.18 to 2.20.21#68

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-01204e4992c3d84782dd005727f21b9a

+11,431-4,970

Commits on Jan 9, 2023

fix: deps/npm/docs/package.json & deps/npm/docs/package-lock.json to reduce vulnerabilities
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